【Unopened, Unused】Mitsubishi Pencil uni Field Architectural Use 2.0mm Mechanical Pencil Lead Refills, Pack of 6 uni2.0-310 Red, 10 pieces Set of 10 2.0 x 130mm Mechanical Pencil Lead Refills These refills use the core of the long-selling, high-quality uni pencils. By evenly mixing graphite with few impurities and clay, they achieve a dark and smooth writing feel. ★ These are replacement leads specifically for the Field 2.0mm mechanical pencil. ★ They cannot be used with the Uni Holder. A 2.0mm mechanical pencil for architectural use, created by a writing instrument manufacturer. Convenient for marking on wood. Some cases may have slight discoloration.